The store had already closed at the time of the shooting, police said.
A search warrant obtained for Stair's Dallas-area residence was made public Friday and included an account from the fourth co-worker.
No comment was immediately from the Pennsylvania State Police.
The victims are 63-year old Terry Sterling of South Montrose who leaves behind family including two young granddaughters, 25-year old Victoria Brong of Factoryville leaves a 6-year old son and 47-year old Brian Hayes of Springville, a father and active member of his church. An unidentified witness was able to flee the scene and call 911.
Jeff Mitchell, the Wyoming County district attorney, sent a press release stating Stair did "extensive damage" to the interior of the store by "shooting up different aisles and counters".
"Stair then proceeded to begin shooting throughout the store, ultimately killing the three victims", Nederostek said.
State police are asking anyone who has information about the incident to call their Tunkhannock barracks as 570-836-2141.
UK prime minister insists she is staying put
Scottish Tory leader Ruth Davidson has spoken to Mrs May about her concerns regarding LGBT rights. The negotiations had been due to start around June 19.
On his Twitter home page, Stair wrote: "I had to die in order to truly live".
Police said the identities of the suspect and victims would not be released until next of kin were notified.
Capt. Jon Nederostek said Stair arrived at the store at approximately 10:52 p.m. Wednesday for his scheduled shift that started at 11 p.m.
Investigators were looking at Stair's online activity for clues to his motive, troopers said.
A man shot dead three people before killing himself inside a store in northeast Pennsylvania early on Thursday, local media reported.
More than a hundred people, holding white roses, gathered to sing, pray and comfort each other in front of the Wyoming County Courthouse Thursday night in the wake of the murder-suicide at Weis Markets in Eaton Township.
In that letter, it says, "I'm a girl who's been trapped in a man's body for two and half decades and I need to get the hell out".
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